=3/2*6/5*10/9*15/14*.
=6/4*12/10*20/18*30/28.
=(2*3)/(1*4)*(3*4)/(2*5)*(4*5)/(3*6)*(5*6)/(4*7)*.(2001*2002)/(2000*2003)
=3*2002/2003
=6006/2003
=3/2*6/5*10/9*15/14*.
=6/4*12/10*20/18*30/28.
=(2*3)/(1*4)*(3*4)/(2*5)*(4*5)/(3*6)*(5*6)/(4*7)*.(2001*2002)/(2000*2003)
=3*2002/2003
=6006/2003